Studies of oxide solubilities in molten KCl-LiCl at 700°C

The reversibility of a membrane oxygen electrode Pt(02)IZr02(Y203) vs O^2- and oxide solubilities in molten KCl-LiCl eutectic (0.4:0.6) at 700°C has been studied by potenti-ometric method. Solubility products of CoO (pP=4.43±0.11), NiO (pP=5.34+0.2), and MgO (pP=5.87±0.05) at 700°C have been determined. Acidic properties of Cd²⁺ and Pb²⁺ have been found to be completely levelled to those of Li⁺. The increase of oxide solubilities and shift of the inflection point on calibration plot as compared with molten KCl-NaCl and CsCl-KCl-NaCl was explained by the increase of acidic properties in the sequence Na⁺-Li⁺.